Duni
Ethan Duni, Mountain View, CA US
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20130332171 | Bandwidth Extension via Constrained Synthesis - Audio signal bandwidth extension may be performed on a narrow bandwidth signal received from a remote source over the audio communication network. The narrow band signal bandwidth may be extended such that the bandwidth is greater than that of the audio communication network. The signal may be extended by synthesizing an audio signal having spectral values within an extended bandwidth from synthetic components. The synthetic components may be generated using parameters derived from original narrowband audio signal. The audio signal may be synthesized in the form of an excitation signal and vocal tract envelope. The excitation signal and vocal tract may be extended independently. In various embodiments, excitation components may be derived from constrained synthesis using a constraint filter with nulls in regions where the extension is desired. | 12-12-2013 |
Ethan R. Duni, San Diego, CA US
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20090306976 | SYSTEM AND METHOD OF AN IN-BAND MODEM FOR DATA COMMUNICATIONS OVER DIGITAL WIRELESS COMMUNICATION NETWORKS - A system is provided for transmitting information through a speech codec (in-band) such as found in a wireless communication network. A modulator transforms the data into a spectrally noise-like signal based on the mapping of a shaped pulse to predetermined positions within a modulation frame, and the signal is efficiently encoded by a speech codec. A synchronization sequence provides modulation frame timing at the receiver and is detected based on analysis of a correlation peak pattern. A request/response protocol provides reliable transfer of data using message redundancy, retransmission, and/or robust modulation modes dependent on the communication channel conditions. | 12-10-2009 |
Ethan Robert Duni, San Diego, CA US
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20120029923 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR CODING OF HARMONIC SIGNALS - A scheme for coding a set of transform coefficients that represent an audio-frequency range of a signal uses a harmonic model to parameterize a relationship between the locations of regions of significant energy in the frequency domain. | 02-02-2012 |
20120029924 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR MULTI-STAGE SHAPE VECTOR QUANTIZATION - A multistage shape vector quantizer architecture uses information from a selected first-stage codebook vector to generate a rotation matrix. The rotation matrix is used to rotate the direction of the input vector to support shape quantization of the first-stage quantization error. | 02-02-2012 |
20120029925 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR DYNAMIC BIT ALLOCATION - A dynamic bit allocation operation determines a bit allocation for each of a plurality of vectors, based on a corresponding plurality of gain factors, and compares each allocation to a threshold value that is based on a dimensionality of the vector. | 02-02-2012 |
20120029926 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR DEPENDENT-MODE CODING OF AUDIO SIGNALS - A scheme for coding a set of transform coefficients that represent an audio-frequency range of a signal uses information from a reference frame that describes a previous frame of the signal to determine frequency-domain locations of regions of significant energy in a target frame of the signal. | 02-02-2012 |
20120046955 | SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR NOISE INJECTION - A scheme for injecting noise at uncoded elements of a spectrum is controlled according to a measure of a distribution of energy of the original spectrum among the locations of the uncoded elements. | 02-23-2012 |
Ethan Robert Duni, San Jose, CA US
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20120303362 | NOISE-ROBUST SPEECH CODING MODE CLASSIFICATION - A method of noise-robust speech classification is disclosed. Classification parameters are input to a speech classifier from external components. Internal classification parameters are generated in the speech classifier from at least one of the input parameters. A Normalized Auto-correlation Coefficient Function threshold is set. A parameter analyzer is selected according to a signal environment. A speech mode classification is determined based on a noise estimate of multiple frames of input speech. | 11-29-2012 |
20130185063 | MULTIPLE CODING MODE SIGNAL CLASSIFICATION - Improved audio classification is provided for encoding applications. An initial classification is performed, followed by a finer classification, to produce speech classifications and music classifications with higher accuracy and less complexity than previously available. Audio is classified as speech or music on a frame by frame basis. If the frame is classified as music by the initial classification, that frame undergoes a second, finer classification to confirm that the frame is music and not speech (e.g., speech that is tonal and/or structured that may not have been classified as speech by the initial classification). Depending on the implementation, one or more parameters may be used in the finer classification. Example parameters include voicing, modified correlation, signal activity, and long term pitch gain. | 07-18-2013 |
Tyler Duni, Oakland, CA US
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20140194095 | SYSTEM AND METHOD FOR MESSAGE IDENTIFICATION AND NOTIFICATION - A message identification and notification method is provided which includes detecting an incoming message from a first user to a mobile communication device corresponding to a second user. A particular indication in the incoming message is detected, and a notification is provided to the second user using the mobile communication device responsive to detecting the particular indication in the incoming message. One or more of an application and a functional component of the mobile communication device is disabled responsive to detecting the particular indication. A communication from the second user to the first user is detected, the communication initiated after the incoming message from the first user, and the one or more of the application and the functional component of the mobile communication device is enabled responsive to detecting the communication from the second user to the first user. A mobile communication device is also provided. | 07-10-2014 |